diff --git a/sys/netinet/tcp_input.c b/sys/netinet/tcp_input.c
--- a/sys/netinet/tcp_input.c
+++ b/sys/netinet/tcp_input.c
@@ -2576,7 +2576,7 @@
 					if (V_tcp_do_prr &&
 					    IN_FASTRECOVERY(tp->t_flags) &&
 					    (tp->t_flags & TF_SACK_PERMIT)) {
-						tcp_do_prr_ack(tp, th);
+						tcp_do_prr_ack(tp, th, &to);
 					} else if ((tp->t_flags & TF_SACK_PERMIT) &&
 					    (to.to_flags & TOF_SACK) &&
 					    IN_FASTRECOVERY(tp->t_flags)) {
@@ -2777,7 +2777,7 @@
 					if (V_tcp_do_prr && to.to_flags & TOF_SACK) {
 						tcp_timer_activate(tp, TT_REXMT, 0);
 						tp->t_rtttime = 0;
-						tcp_do_prr_ack(tp, th);
+						tcp_do_prr_ack(tp, th, &to);
 						tp->t_flags |= TF_ACKNOW;
 						(void) tcp_output(tp);
 					} else
@@ -2791,7 +2791,7 @@
 				if (V_tcp_do_prr) {
 					tp->sackhint.delivered_data = BYTES_THIS_ACK(tp, th);
 					tp->snd_fack = th->th_ack;
-					tcp_do_prr_ack(tp, th);
+					tcp_do_prr_ack(tp, th, &to);
 					(void) tcp_output(tp);
 				}
 			} else
@@ -3920,7 +3920,7 @@
 }
 
 void
-tcp_do_prr_ack(struct tcpcb *tp, struct tcphdr *th)
+tcp_do_prr_ack(struct tcpcb *tp, struct tcphdr *th, struct tcpopt *to)
 {
 	int snd_cnt = 0, limit = 0, del_data = 0, pipe = 0;
 	int maxseg = tcp_maxseg(tp);
diff --git a/sys/netinet/tcp_var.h b/sys/netinet/tcp_var.h
--- a/sys/netinet/tcp_var.h
+++ b/sys/netinet/tcp_var.h
@@ -838,6 +838,8 @@
 VNET_DECLARE(int, tcp_do_autorcvbuf);
 VNET_DECLARE(int, tcp_do_autosndbuf);
 VNET_DECLARE(int, tcp_do_ecn);
+VNET_DECLARE(int, tcp_do_prr);
+VNET_DECLARE(int, tcp_do_prr_conservative);
 VNET_DECLARE(int, tcp_do_newcwv);
 VNET_DECLARE(int, tcp_do_rfc1323);
 VNET_DECLARE(int, tcp_tolerate_missing_ts);
@@ -1063,7 +1065,7 @@
 void	 tcp_clean_sackreport(struct tcpcb *tp);
 void	 tcp_sack_adjust(struct tcpcb *tp);
 struct sackhole *tcp_sack_output(struct tcpcb *tp, int *sack_bytes_rexmt);
-void	 tcp_do_prr_ack(struct tcpcb *, struct tcphdr *);
+void	 tcp_do_prr_ack(struct tcpcb *, struct tcphdr *, struct tcpopt *);
 void	 tcp_sack_partialack(struct tcpcb *, struct tcphdr *);
 void	 tcp_free_sackholes(struct tcpcb *tp);
 int	 tcp_newreno(struct tcpcb *, struct tcphdr *);